Just enter your weight and it will tell you what sail size to use for any wind in kts, mph, and kmph. I got the formulas for it from this forum and others. Obviously there are other considerations when selecting sail size, but this might help.

Nicely presented but not very accurate or even close to me, e.g 68kg and 30 knots gives a 3.0 sail...
I think the model is just to simple, for me at 68kg a get a better fit using e.g: A=1+90/V rather than just A=91/V as you use. I&#39;m not sure how this would translate to other body weights.

im saying ther eis something wrong too. me on a 4.2 in 20 knots? lol im 6 foot... Its an interesting concept though. i don&#39;t think you can do this because certain people like being overpowered and are used to that. Its too personal.

Maybe do something where you enter a wind strength and the sail you would use, and your wieght or something and have it figure it out. Something to base your skill/needs on

Why ????
Will never work.
Sail choice can vary at least 20% on same day depending on what you are doing ??? Max speed ? Jumping ??? Racing ??? Playing ???
Thats before you factor in weight/skill/ strength !!!